Ionic solvents used in ionic polymer transducers, sensors and actuators
View Patent ↗Ionic liquids are incorporated into transducers, actuators or sensors which employ the ionic polymer membranes. The ionic liquids have superior electrochemical stability, low viscosity and low vapor pressure. The transducers, actuators and sensors which utilize ionic polymer membranes solvated with ionic liquids have long term air stability. Superior results are achieved when a conductive powder and ionomer mixture is applied to the ionic polymer membrane to form the electrodes during or after the ionic liquid is imbibed into the ionic polymer membrane.
1. A transducer, actuator or sensor, comprising:
an ionic polymer membrane having at least a first ion selected from the group consisting of cations and anions covalently bonded to said ionic polymer membrane, and wherein said at least a first ion can ionically interact with a second ion which is not bonded to said ionic polymer membrane;
electrodes adhered to opposite sides of said ionic polymer membrane; and
an ionic liquid positioned in said ionic polymer membrane,
wherein said ionic polymer membrane is configured to permit deformation.
2. The transducer, actuator or sensor of claim 1 wherein said ionic polymer membrane is comprised of a perfluorosulfonic acid polymer.
3. The transducer, actuator or sensor of claim 1 wherein said ionic liquid is selected from the group consisting of substituted or unsubstituted pyridinium compounds, pyridazinium compounds, pyrimidinium compounds, pyrazonium compounds, imadazolium compounds, pyrazolium compounds, thiazolium compounds, oxazolium compounds, and triazolium compounds.
4. The transducer, actuator or sensor of claim 1 wherein the ionic liquid is 1-ethyl-3-methylimidazolium trifluoromethanesulfonate.
5. The transducer, actuator or sensor of claim 1 wherein said electrodes are formed from a conductive powder and ionomer solution.
6. The transducer, actuator or sensor of claim 1 further comprising an input voltage which is applied to said electrodes to cause said ionic polymer membrane to deform.
7. The transducer, actuator or sensor of claim 1 , further comprising a means for measuring a charge in said ionic polymer member due to deformation.
8. The transducer, actuator or sensor of claim 1 wherein said ionic polymer membrane is in a cantilevered configuration which permits a tip end to flex.